Error with OWA / Exchange 2003 - Invalid procedure call?

I'm having a problem with some workstations accessing Outlook Web Access. All workstations are running Windows XP Pro SP2 with IE7. For the workstations that aren't working the problem is when viewing the inbox, calendar, contact or anything, the contents section just says "Loading..." and never brings the info there. The bottom of IE, there is an error that says:

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